This also happened to my own 2019 16" Intel MacBook Pro, and an acquaintance with that same model laptop even had it happen twice - to both the original and the replacement screen.
In all cases it wasn't a full crack but rather some sort of depression/fold mark, starting near but not touching the bottom edge, and all shared a similar bendy shape.
We both individually got the standard "first time we're seeing this" when first contacting support, and also both felt there was some sort of unnatural/forced tight-lipness or non-responsiveness in response to any speculation as to the cause.
To me this behaviour indicated that they were not particularly happy with either the responses they were giving, the nature of the request, or whatever obvious or non-obvious consequences any of this would have for either party.
In all cases it wasn't a full crack but rather some sort of depression/fold mark, starting near but not touching the bottom edge, and all shared a similar bendy shape.
We both individually got the standard "first time we're seeing this" when first contacting support, and also both felt there was some sort of unnatural/forced tight-lipness or non-responsiveness in response to any speculation as to the cause.
To me this behaviour indicated that they were not particularly happy with either the responses they were giving, the nature of the request, or whatever obvious or non-obvious consequences any of this would have for either party.